Drill-carrying arm for multiple-spindle drills



Feb.' 6, 923.

L E. W. CLEVELAND DRILL CARRYING ARM FOR MULTIPLE SP1 NDLE DRILLS FILED SEPT. l5.

E FREE Patented Feb. 5, 1923.

i naires stares 1,444,331 PATENT QFFECFL.

EDG-AR W, CLEVELAND, 0F HOLLAND, MICHIGAN.

:DRILL-CARRYNG ARM FOR MULTIPLE-SPINDLE DRILI'S.

Application filed September 15, 1919. Serial No. 323,780.

and l do hereby declare the following to bey a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and u se the same.

This invention relates to a mechanism adapted to be applied to the adjustable arms which carry drills in multiple spindle drills. The invention relates to and comprises various improvements in the construction shown in my vprior application, Serial No. 282,225, filed March 12, 1919, patent on which will issue September 16, 1919. It is an object and purpose of the present invention to provide a means for holding the drill carrying arm against the head or other support in a multiple spindle drill so that the lsame shall not drop at its drill carrying end when released for adjustment to a diierent position, the device used for this purpose being readily applicable to multiple spindle drills already manufactured and in use without change of construction of the machine. A further object of the invention is to construct this attachment for the arms of a i multiple spindle drill in a very simple and economical manner whereby the same may be readily manufactured at low cost. A still vfurther object of the invention consists in the provision of'an attachment of this kind which when applied to an arm of a multiple spindle drill serves to hold the arm against the head of the machine by a yieldable spring pressure when the arm is'relieved for adjustment, this spring pressure being uniformly maintained or increased as the arm is released and similarly maintained or diminished when the arm is tightened and boundsecurely against the head thereby relieving the strain on the spring means during the time when it is not needed.

Forfanunderstanding of the invention and the construction embodying the same, reference may be had to the'accompanying drawings, in which:

Fig. 1 isa partial Aside elevation and vertical section illustrating the application of 'ing-farm of a Fig. 2 is a plan view of the arm, the bolt used to attach it to the head being shownin transverse section.

Fig. 3 'is a fragmentary side elevation of the lower part'of' the attachment which is used with the arm.

' Fig. 4i is a fragmentary side elevation and section somewhat enlarged, of the attachi 'ment shown in Fig. 1, being slightly modified so as to increase the spring pressure with the release oi' the arm for adjustment.

Fig. 5 is a side elevation and section taken on the line 5-.5 of Fig. 4f.

Fig. 6 is a partialside elevation and section showing a modified foi-1n of construction serving the same functions as that shown in Fig. 1.

F ig. 7 is a similar view of a yet further modification; and

Fig. 8 is a horizontal section taken on the line 8 8 of Fig. 7.

j Like reference characters refer to like parts in the different views of the drawing.

The arm l may be of any preferred construction and at one end carries a drill hold- Vbefore my invention, application for which has been referred to, it was common to use only this binding nut on the lower end of the bolt and when the arm was adjusted the lnut was released and, due to the heavier end oi the arm. carrying the drill spindle, such end of the arm tended to tilt or drop downwardly and throw the drill carried by the drill spindle away from true vertical position. This necessitated considerable trial and eiiort` to properly adjust they arm to the desired position, `greatly increasingthe time spent 4in making a set-up on each `arm'in an adustable `multiple spindle drill.

With inventionthe nut 7 used to bind Vthe arm against 'the head 4 or similar supvend' inf asqnaredf portion .91 adapted to receive a wrench. 0n the threaded portion of the extension 8 a nut 10 is placed serving as a support for a leaf spring 11 the ends of which are curved as indicated at 12, to bear against the under side of the arm at each side of the slot through the arm, while the intermediate portions of the ends of the spring between the curved parts 12, project into the slot as indicated at 13. This holds the spring :from any rotative movement. The nut is held against rotative movement by a rib 14 thereon whicheztends into a notch or depression in the lower member oit the spring 11 as shown.

It is apparent, with this construction, that on turning the member consisting oiI the binding nut 'r' and the extension 8 so as to release the arm from the head, the spring vpressure oi'f the spring` 11 does not vary, provided that the threads on the lower end' of the bolt and on the extension S are the same. The spring may be regulated to any desired tension and lett at that tension and whatever is done to the member consisting of the binding nut and its extension 8, this tension of the spring servingfto yieldingly hold the arm against the head L1 remains constant. rlhe 'force of the spring is designed to be suiiicient to normally hold the arm against the head and lreep its heavier' end trom dropping in any respect, yet with the spring` Vcapable of yielding to permit the arm to be moved with respect to the head for its adjustment to a new position. It is evidentr that this construction is a unit which may be applied directly to the lower ends ofthe usualbolts used to secure the arms on the head of a multiple spindle drill that it may be applied readily to constructions g already in use.

In. Figs. l? and 5 a Slight modification is shown in that the extension 8 to the binding` nut -7 is more finely threaded than is the lower end o'lthe bolt 5, this resulting in increasing the force oi' the spring 11 against the arm when the binding nut is released. This is of value. as the spring is not at all times held under full strain but is relieved during the times when it is not of use, being increased at those times when it hasto perform its functions.' The same effect may be obtained by making parts 5a and Sa with the same number of threads but with part 5a double threaded and 8 single threaded.

ln Fig. 6 a slight modification in construction is shown. The binding nut 15 in this construction comprises a rod interiorly bored and threaded at its upper end to engage with .the lower end 5a of the bolt 5, threaded at its lower portion to receive a nut 16, and squared at its lower end as indicated at 9a. A strong coiled spring 17 is placed around the` rod 15 having its lower end connected with the nut '16 while its upper end passes Vthrough the washer 18, interposed between the arm and the rod 15. The upper end of the spring extends into the vertical slot in the arm. rlthe spring is held from rotation by the engagement of this upper end with the arm,- and the nut 16 is held from rotation other than a very limited amount by the torsional force of the spring. VThe action, so far as holding the arm in horizontal position with a yielding pressure, is the saine as in the constructions shown in Figs. 1 to 5 inclusive.

ln Figs. T and 8 a still further modification is shown. rllhe bolt 5 has an integral cxtcnsionv19 oi smaller diameter at its lower end on which an exteriorly threaded plug 2O is secured by means of a set screw 21. A sleeve `22 is placed over the extension 19 and threaded into the threaded portion 5a ot the bolt 5, while the plug 20 is threaded into the lower end of the sleeve. A. coiled spring 23 is located within the sleeve around the part 19 and between the plug 20 and the :lower ends of two pins 24 which pass looselyv through the upper end of the sleeve 22 and bear against the washer which is 1nterposed between the sleeve and the lower side ot the arm whereby the spring pressure is transmitted to the arm to hold it in horizontal position. tension of the spring is more easily adjusted than in the others, it being necessary merely `to loosen the set screw 21 and turn the plug 20 to any desired position after which it is again fixed to the part 19. /Vhen the sleeve 22 is turned to release the arm to permit its adjustment it threads downwardly lon to the plug 20 so that the tension of the spring is not changed and this tension of the spring is directly transmitted to the arm to yieldingly hold it against the head 4.

All ot these constructions are readily adapted Vto be applied to the arms otmuitriplo spindle drills which are now in use without the necessity of changing or re designing such arms. ln the construction shown in Figs. 7 and 8, new bolts having an extension 19 thereto would be necessary but in the other the old bolts now inuse can be used. I have shown` the invention as applied to a short length of arm using one bolt only to hold vit in position but it may be applied to the longer arms which use more than one bolt, the device being applied to either one or more ot the bolts associated with an arm as may seem advisable.

- Various other modifications to accomplish the ends desired may be resorted to without departing from` the inventionV which is defined in the appended claims and I, accordingly, consider myself entitled to all such modiiications as come within the scope of the claims defining the invention'.

I claim:

. 1. In afmultiple spindle drill, an arm sup-v port, an arm locatedagainst the support, a

In this constructiony the.

bolt mounted on the support and passing through the arm, a means detachably connected to the end of the bolt for binding the arm against the support to hold the same in fined relation thereto, said means being ope-rable to release the arm 'for adjusting movement with respect to the support, and yielding means associated wi h the first means for yieldingly holding the arm against the support when the first means is' released, said yielding means being located beyond the end of the bolt and having its tension maintained during operation of the lirst means, substantially as described.

2. ln a multiple spindle drill, an arm sup port, an arm located against the under side ot' the support, said arm being provided with a rotatably mounted vertical drill spindle. a bolt connected to and depending' 'from the support, said bolt passing through the arm, means threading on to the end of the bolt for securing the arm in fixed relation to the support, yielding means mounted on the securing means and engaging against the arm to hold the arm against the support when the securing` means is operated to tree the arm for adjustment, and means to maintain the tension of the yielding means during op-v eration or' the securing means, substantially as described.

3. In combination, an arm support, an arm located against the under side of the support, said arm carrying a drill spindle, a bolt connected to and depending from the support through the arm, a securing means threaded on to the lower end of the bolt and engageable against the arm to secure the same against the support, becoming inop- .erative for such purpose when moved on the bolt away from the arm, and spring means carried by the securing means and bearing against the arm to hold it against the support when the securing means is inoperative, and means for rendering the operation of the securing means to free the arm inelfective to lessen the pressure of the spring against the arm, substantially as described.

4. ln combination, an arm'support, an arm located against the under side of the support, a bolt connected to and depending from the head through the arm, means threaded on to the lower end of the bolt adapted to be operated to secure the arm in iixed relation to the support, said means having a downwardly projecting extension,

a nut threaded on to said extension, a spring carried by the nut and bearing against the arm, and means connecting the spring and nut to hold the nut against turning when said extension is turned with the lirst means 9 in releasing' the arm 'trom the suppot. substantially as and for the purposes described.

5. ln combination. a support, an arm located against the under side of the support, a bolt connected to and depending from the support and passing through the arm, an elongated member interiorly bored and threaded at its upper end to thread on to the lower end ot the bolt and secure the arm in lixed relation to the support, the lower portion of said member being exteriorly threaded, a nut threaded on to said lower portion oli the member, a spring under com` pression disposed between the nut and the lower side of the arm, interengaging means between the spring and arm to hold the spring from rotative movement, and means for releasably holding the nut against rotative movement with respect to the spring, whereby said means is normally effective but is capable of being rendered ineffective so that the nut may be operated to adjust the :torce ot the spring, substantially as described.

6. In combination, a support, an armlocated against the support, a bolt connected to the support and extending therefrom through the arm, a member threaded on to the end ol the bolt against the arm, a spring, means having threaded connection with the member on which the spring rests, the spring being disposed between said means and the arm, and means to hold said first means from turning with the member when it is operated to release the arm from the support, substantially as and for the purposes described.

7. In combination, a support, an arm located against the support, a bolt connected to the support and extending therefrom through the arm. means threaded on to the end of the bolt to releasably bind the arm to the support?, a springcarried by said means and yieldingly pressing the arm against the support, and means for increasing the tension of the spring when said first means is moved to release the arm, substantially as described.

ln testimony whereof l aiX mv signature.

EDGAR W. CLEVELAND. 

